128 Mr. E. A. Owen on Change of Resistance of Nickel 



The results obtained are given in figs. 4, 5, and 6. It is 

 observed that there is a decided maximum change o£ resistance 

 in each case (see Table II.), followed by a diminution in 

 stronger fields *. 



Table II. — Maximum values of Ac/>. 





Maximum 



H 



in c.G.s. 





value of A<p. 





units. 



Experiment I. — Nickel wire; diam. "0206 mm. 



001462 





2800 



Experiment II. — Nickel wire ; diam. -0159 mm. 



001418 





2800 



Experiment III. — Iron wire; diam. -0208mm. 



000222 





1900 



Fig. 4.— Nickel (-0206 mm. diam.). Temperature = 18°-5 C. 



1.500 



1.400 



1.300 



1.200 



I.I 



1,000 



>oo 





10,000 



20,000 30.000 



* It has recently been brought to my notice that a maximum value in 

 the magnetic change of resistance of nickel was also observed bv 

 R. Dongier (Beiblcitter z. d. Ann. d. Physik, Bd. 27 ; p. 677, 1903), but I 

 have not seen any details of his measurements. 



